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2 Simple Application Controllers
The Command String 7
7 - 3
7.2 Format “B” Message
Table 7.2: Format B message structure
Control Protocol
READ
Transmit
Receive
WRITE/(RUN/STOP) OPERATION
Transmit
Receive
FORMAT B
Computer
α
2 Controller
S
T
X
Command
No. comm
bytes
Format No.
Station No.
Device No.
(HB)
No. of
devices
Device code
Device No.
(LB)
Sum check
(HB)
E
T
X
Sum check
(LB)
or
Complete flag
No. comm
bytes
Format No.
Station No.
Command
No. comms
bytes
Format No.
Station No.
Sum check
(LB)
No. of
devices
Device status
Sum check
(HB)
N
A
K
No. comm
bytes
Format No.
Station No.
Error Code
S
T
X
S
T
X
S
T
X
E
T
X
Computer
α
2 Controller
S
T
X
Command
No. comm
bytes
Format No.
Station No.
Device No.
(HB)
No. of devices
Device code
Device No.
(LB)
Sum check
(HB)
E
T
X
Sum check
(LB)
Device status
Complete flag
No. comm
bytes
Format No.
Station No.
S
T
X
S
T
X
A
C
K
No. comm
bytes
Format No.
Startion No.
S
T
X
N
A
K
No. comm
bytes
Format No.
Station No.
Error Code
or